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12 tips for getting the best sound quality in your car

Jeff has worked in the car audio industry since college and has designed and installed hundreds of car systems. He spent a handful of years at Crutchfield, helping take our company to new heights. After a productive tenure with us, he has moved on to a new challenge, but his enthusiasm and expertise still guide us.

A car can be a great place to enjoy music, but many commuters still put up with marginal sound quality that they'd never tolerate at home. Others assemble sophisticated sound systems for their cars, then make common installation mistakes that keep the system from reaching its full potential.

I've put together some suggestions on how to improve the sound in your vehicle, with tips for both simple factory systems and more sophisticated setups. You don't have to live with bad sound in your car. Even the simplest improvements to your system can yield noticeable results.

Kicker KS Series speakers

Tip #1: Replace your car's speakers

In most cases, the speakers are just about the last thing a manufacturer thinks about when designing and building your car. Factory systems have gotten better over the last few years, but many so-called "premium" systems still use relatively inexpensive amps and speakers that don't deliver top-notch sound.

You can make a big difference in your system's sound quality by installing a nice set of aftermarket speakers. You'll hear tighter bass and more overall clarity, and you'll most likely notice details you've never heard before in songs you've known for years.

Replacement speakers give you maximum bang for your buck, so they're a terrific first step on the road to better sound.

Tip #2: Select a lower level of compression for your music files

Yes, you can store more music files in your music player if you use greater compression, and they'll sound okay when you're listening through earbuds. But you lose some high- and low-frequency information when you compress your music, along with some of the details that make your music interesting. And, on a good car audio system, you can really tell that something's missing.

Don't settle for the default setting when creating your files. If you want to use your iPod, smartphone, or MP3 player in your car, try using as little compression as possible. The higher the bit rate, the better your music will sound through your car's system.

A digital-to-analog converter, or DAC, has the job of converting digital information — 0's and 1's — into analog music signals. Your music player's built-in DAC usually does a good enough job for casual listening with earbuds, but it doesn't deliver the same level of performance you can get from the more advanced DACs found in many of today's better car stereos. Fortunately, if you can connect your iPod or phone to your aftermarket stereo via a USB cable, you might be able to bypass your device's DAC. It depends on the individual stereo, so be sure to check the stereo's "Hands-on Research" info on the Crutchfield website for confirmation.

Tip #4: Use Dynamat or another sound deadening material

By reducing vibration and road noise, Dynamat does two things to make your system sound better.

First off, a door panel isn't the best place for a speaker — the thin metal vibrates as your music plays, which affects the accuracy of the sound. When you attach Dynamat to your door panel, it deadens those vibrations and creates a more stable platform for your speaker, more like the wooden baffle on a home speaker.

Second, have you ever noticed how your system sounds really good at 25 mph, but gets a little harsh when you hit 60? Road noise tends to mask the lower frequencies first, so your system sounds overly bright when you turn it up at highway speeds. Dynamat lowers interior noise levels in your car, so you don't have to turn your music up as loud when you're driving. You'll hear more musical detail, and your amps won't have to work as hard. And that's all good.

Tip #5: Add an amplifier

You may be saying "My factory stereo puts out 200 watts, and that's plenty of power." But there's a huge difference between 50 watts peak power per channel produced by your car stereo and 50 watts RMS from an outboard amplifier. A separate amplifier will provide more clean power than any car stereo, and that'll make a night-and-day difference in sound quality. Your system will sound better, whether you listen to Mahler at a conversational level or Megadeth turned up to 11. An amplifier is essential to getting great sound in your car.

Tip #6: Add a signal processor or an equalizer

The interior of a car presents some serious problems when it comes to sound quality. Glass and plastic surfaces reflect sound like crazy, while carpet, seat covers, and other absorbent materials soak it up. Add poorly-placed speakers to the mix, and you wind up with significant frequency response peaks in most car interiors. These peaks make your music boomy in the bass or shrill in the upper frequencies, causing "ear fatigue."

AudioControl's EQL equalizer features 13 bands of equalization, and its level matching controls get maximum voltage to your amps.

Most car receivers give you treble, midrange, and bass controls — useful for global fixes but not for zeroing in on problem areas. You'll need an equalizer to kill these peaks, whether it's built into your receiver or in a processor mounted in your dash or near your amplifiers.

An outboard equalizer gives you multiple points for adjusting frequency response, so you can iron out those peaks in your system. A parametric equalizer allows you to vary the centerpoint and width of each EQ band, so you can really zero in on a problem area. Sound processors help you eliminate frequency response peaks and increase bass response, and some even include a microphone for analyzing your car's acoustics.

Tip #7: Build a better sub box. Or buy one.

If you're building a sealed subwoofer box, make sure it's sealed properly. Air leaks can really hurt your sub's performance. If you're using a ported box, make sure you've got the right sub in there. You can destroy a sub that's designed for sealed box use by driving it hard in a ported enclosure. Also, it's important to build a box with the correct interior volume for the sub you've picked out. A mismatch can result in poor performance or a sub fatality.

You can also avoid all of these issues by buying a premade enclosure that'll work with your subwoofer.

Tip #8: Your crossover can really improve the sound of your system

Many in-dash receivers now include frequency filters that'll work with your preamp and speaker outputs. If you have a sub, use the high-pass filter to remove the low bass from your car's full-range speakers. You'll get more clean volume out of them, particularly if you're driving them with the receiver's built-in power. Or maybe your sub sounds really strong, but the bass sounds like it's coming from behind you. Experiment with raising or lowering the crossover point on your low-pass filter, and you'll be able to bring the bass up forward with the rest of the music.

This amplifier features front and rear frequency filters.

Many amplifiers feature subsonic filters that remove super-low bass below the range of human hearing. Go ahead and turn it on — your amp and sub will run cleaner without that subsonic sludge. Also, the compression you use to create your music files can cause a low-frequency sputtering sound in your subs. Your subsonic filter can remove or minimize this noise.

Tip #9: Set your amp gains properly

Our Tech Support people field calls every day from customers who can't understand why their new car audio system sounds so bad. The #1 problem? Most people think the gain control on their new amplifier controls the volume level. Naturally, they turn it all the way up, which causes bad things to happen. The gain control actually adjusts the amount of input signal coming into the amplifier. When you crank it up too high, you'll hear some seriously nasty distortion.

Setting the gains properly on this Sound Ordnance amp will keep your system distortion-free.

The general idea is to turn your receiver's volume control roughly 3/4 of the way up to maximum volume, then turn up your amp gain until you hear distortion. Back it off a little, and you're all set. Every amp manufacturer will have specific suggestions, so you'll want to check out your manual for the best way to set the gain on your new amplifier.

This JVC navigation receiver offers a 13-band iEQ and plenty of user presets.

Tip #10: Don't max out your tone controls

Boosting your factory radio's tone controls up to 11 might make your system sound better in your driveway, but it just creates distortion when you turn it up on the highway. A heavy low-frequency boost, in particular, will put a big strain on your factory system. If you want to fatten up your sound, try using a smaller boost in the bass, lower the highs and mids a touch, and then turn up your overall level a little more.

But maybe you've replaced your factory radio with an aftermarket stereo that features a multi-band equalizer. The same rule still holds true — avoid excessive tone boosts or cuts if possible. A bad EQ setting can make a good system sound terrible, while an intelligent tone curve can make a good system sound great.

For a number of very good reasons, it's never a good idea to fool with your EQ on the road. If you can, program a few different EQ presets into your receiver, so you can see what works best in your car without having to adjust settings while you're driving. Or cycle through your receiver's preset curves to see if one of them sounds particularly good at highway speed, then customize that setting in your driveway.

Tip #11: Add a sub and hear what you've been missing

I've installed a lot of car audio systems, and I still love to see that "Wow" moment when somebody hears a sub in their car for the first time. A good subwoofer will bring the bottom octave of your music back into proper balance, so you'll hear familiar tunes in a whole new light. A subwoofer will take a load off your full-range speakers too, since you'll be playing your tunes with the bass control set at "0" instead of "+5".

Some people develop a negative opinion of subwoofers when they sit next to a thumping, vibrating car at a traffic light. But subs aren't just about the boom — you can adjust any subwoofer to fit your musical tastes and your vehicle. And once you drive with a subwoofer, you can never go back to living without one. Or two.

Tip #12: Use a capacitor if you're going to push your subs hard

The people who designed your car probably didn't have subwoofers in mind when they built your vehicle. Big bass sucks up a lot of power, and most car electrical systems aren't equipped to deal with it. A capacitor acts as a buffer between your amps and your car's battery. You connect the cap inline on the power cable from your battery, as close to the amp location as possible. It stores up power from your battery, then releases it instantly to satisfy your amp's demand for the power needed to reproduce a big bass hit.

Have you ever noticed a big drop-off in performance after running your subs loud and hard for a minute or two? Or watched your headlights dim in time to the music while you're driving at night? A capacitor cures these problems by taking the brunt of those demand peaks away from your amp, so your amp sees a more consistent supply of power.

Bonus Tip: Use high-quality cables for your amplifiers

Electricity is like running water. You wouldn't run a garden hose from your well to your house, because not enough water would get through to keep up with demand. That's why you don't want to use cheap, undersized power cable to get power to your amplifiers — the amp will be starved for power when you start pushing up the volume control. A good power cable allows current to flow freely so your amp gets the juice it needs during peak demand.

High-quality patch cables promote better signal flow from your receiver to your amps, so you hear a more focused, detailed sound. And good patch cables will also reject noise caused by your car's electrical system. Don't believe it? Ask any guitar player about the importance of good cables.

Comments

Thanks for sharing such a informative article. A good subwoofer will bring the bottom octave of music back into proper balance, so you'll hear familiar tunes in a whole new light.

Posted on 5/21/2015 5:39:50 AM

Moses from Malaysia

Hi
My head unit does have "Loudness" function. should i turn it on when using amplifier?

Posted on 6/17/2015 1:45:49 AM

Robert Ferency-Viars from Crutchfield

Moses, yes you can safely use your loudness feature with your amplifier. But often, if you have your amp tuned nicely, turning on the loudness can make the music sound muddy or a little distorted. So try it with and without the loudness, and adjust your amp so that you're happy with what you hear.

Posted on 6/17/2015 1:26:50 PM

Alex from Texas

I am going to install Rockford Fosgate R600X5 amp, what cables should I use?

Posted on 7/6/2015 1:22:54 AM

Alex from Texas

How good are the Nakamichi car stereos?

Posted on 7/6/2015 1:29:58 AM

Alexander Hrabe from Crutchfield

Alex, check out this Crutchfield staff review of one of the most recent Nakamichi CD receivers.

Posted on 7/6/2015 9:34:18 AM

Alexander Hrabe from Crutchfield

Alex, depending on your application, Rockford Fosgate has a number of cable packages that will work with this receiver. Check out the "Accessories" tab on the Rockford Fosgate R600X5 page. You may also find our car amplifiers FAQ useful.

Posted on 7/6/2015 9:40:01 AM

Gregory Guza from Berwyn, IL

Hi, what options do I have for improved sound quality in my 2015 Dodge Journey SXT with the base stereo (4.3 screen unit)? It obviously sounds weak since this system doesn't have an amplifier at all and the music seems to lose power during the vocal parts of songs and then come back up during the non-vocal parts-which is extremely annoying. Replacing the head unit isn't an option anymore on today's new cars since they now incorporate the HVAC controls and other vehicle features and option controls in the head units. It's really stupid that they force you to deal with lousy sound by sticking other things in the stereo so you can't replace it.

Posted on 7/12/2015 12:22:49 AM

Alexander Hrabe from Crutchfield

Greg, you're right -- dashes have become more complicated, but we have integration solutions for a growing number of new cars. I've passed your info along to a Crutchfield advisor who will contact you soon with solutions for your Dodge Journey.

Posted on 7/13/2015 8:56:35 AM

tony moon from United States

I have a pioneer 700bt double din. Will the d1 00 amp hook up with RCA cables in back of receiver and to the amp? I have 61\2 inch speakers in the doors will it work ok? My main question is how it is hooked up to receiver and amp! Thanks Tony!

Posted on 7/19/2015 8:10:32 PM

Alexander Hrabe from Crutchfield

Tony, if you're referring to the Pioneer GM-D1004, you won't be able to power it through a connection with your receiver since your receiver uses a 10-amp fuse and the amp requires connection to a receiver with a 15-amp fuse. You'll have to power the amp directly from the battery. With that receiver/amp combo, you'll have your choice of RCA or speaker-level wiring. If your speakers are aftermarket, they should be able to handle that new dose of power just fine.

Posted on 7/20/2015 9:54:54 AM

Garo from Montreal, Canada

Hi! I'm still using tube amplifier at home. I reasantly bought a Mercedes e320 2000 and I would like to improve the sound system...what do you think of Alpine system with navigation? I like to hear from you. thanks

Posted on 7/28/2015 8:34:32 AM

Alexander Hrabe from Crutchfield

Garo, An Alpine receiver with navigation is a great choice, but we need some more information about your vehicle before we can make a recommendation. You can use our vehicle selector to confirm which stereos fit your car or give us a call at 1.888.955.6000.

Posted on 7/28/2015 9:21:08 AM

Lynn w. Blackman from San Leandro

i just want to see more door speaker installations for components. For maximum performance

Posted on 7/30/2015 7:46:51 PM

Alexander Hrabe from Crutchfield

Lynn, we have quite a few articles about component speakers and even more vehicle profiles that detail specific speaker installations. This list is a great place to start. You might also enjoy our Car Audio Proving Ground series.

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